Improvement in calculators for manufacturers of picture-frames



Z Sheets-Sheet 1. B. KILBOURN,

CALCULATORS FOR MANUFACTURERS 0F PICTURE-FRAMES.

N0.17Z,Z70. Patented Jan. 18,1876.

% 7 u-izgg III-I535 2 Sheets-Sheet 2.

CALCULATORS FOR MANUFAC U Ens 0F PICTURE-FRAMES. No.17Z,Z70. PatentedJan.18,1876.

UNITED STATES PATENT QFFICE.

BEEOHER KILBOURN, or BIGHFIELD srntnes, n w'YoRK.

IMPROVEMENT IN CALCULATORS FOR MANUFACTURERS 0F PICTURE-FRAMES.

Specification forming part of Letters Patent No. [72,270, dated January18, 1876; application filed August 6, 1875.

To all whom it may concern Be it known that I, BEEGHER KILBOURN, of thetown of Richfield Springs, county of Otsego and State of New York, haveinvented a scale for the ready and accurate computation of the amount ofthelinear andboard measure feet of molding in picture-frames; and Ihereby declare that the following is a true and full description of myinvention, reference being had to the accompanying drawing as a part ofthis specification, in which Figure 1 is full, and Fig. 2 a partial,plan vlew.

I construct my scale in the following manner: Upon a suitable card, A,Fig. 1 of the drawing, I print the scale of inches and parts of inchesin the subdivisions of the arc B, which figures indicate the width ofmolding used in the construction of the frame, the amount of stock ormolding in which is to be ascertained upon the same card A, and in acorresponding curve under and adjacent to said are B I construct andequally subdivide the are C, in

whose subdivisions I place the consecutive numbers, which represent andindicate the dimension of the frame in its length or breadth in inches.Now, upon the movable card D, and at its outer circular edge, I printthe consecutive numbers in equal subdivisions, and similar spaces tothose above and below mentioned, which are and numbers E indicate andrepresent the dimension of the frame in its opposite direction, andadjacent to and beneath or inside of said last-mentioned are E I printthe are F, with its consecutive numbers in similar subdivisions,indicating (the larger figures) feet and (the smaller figures) inches,and representing the total number of feet in any frame to beconstructed. I now attach the card D at its center to the center of thecircle of the arc B of the main card A by means of an eyelet or rivet,H, and puncture the hole G as a means of moving the card D around itscenter H.

The operation of myinvention is as follows: I find on the edge of themovable card D, in the are E, the length of theend of the frame. I placethis figure under the figure in the are 0 representing the length of theside of the frame. Now, in the arc B I find the width of the molding,and directly under this on the arc F I find the total in inches, and thenumber of feet to be added is found at the next large figure at the leftof the inches. For example, a frame eighteen by twenty inches of threeand one-fourth inch molding, wanted the total length of molding in theframe. Placing 18 on the outer edge of card D, under 20 on are 0, I findunder 3% of arc B, 6 in arc F, and to the left of such 6 I find 8-thatis, there are necessarily used in constructing such frame, waste'at thecorners included, a strip of three and one-fourth inch molding eightfeet and six inches long. I also construct inside the arc F the blankarcs I I shown in the drawing, for the purpose of inserting a list ofprices for the molding, and also for the glass commonly used withpictures, in order that their cost can be computed at the same time asthe quantity of molding required.

My invention saves time, and makes an error impossible, if the scale isused according to the directions printed thereon.

I claim- The combination of a fixed and a movable chart, the one bearingscales of one of the necessary dimensions of a frame, and also the widthof the molding, and the other chart bearing a scale of the otherdimension of the frame, and one or more series of results, all separatedby suitable indexial lines, substantially as and for the purpose setforth.

BEEOHER KILBOURN. Witnesses: H. O. WATSON, A. R. ELWooD.

